Hot-blast stove



Oct. 23, 1928. 1,689,042

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Oct. 23, 1928.

F. R. M GEE HOT BLAST STOVE Filed Aug. 9, 1926 2 Sheets-Sheet 2 it sFRANK B. MCGEE, 0F STEUIBENVILLE, OHIO.

HOT-BLAST STOVE.

Application filed August 9, 1926. Serial No. 128,251.

This invention relates to hot air blast stoves tor use in heating thehot blast for blast furnaces, and has for one of its objects theprovision of an improved form of single pass stove having an improvedchcckerwork therein to increase its efiiciency.

Another object is to provide a stove of a U- shape whereby the workingends are both at the top and all underground flues, dampers, valves andother parts are eliminated.

Another object is to provide a stove in which the checker-work issupported directly on the shell, thereby eliminating the necessity forsupporting arches, pillars, etc, as constructed in the forms of stovesnow generally in use.

A further object is to provide a stove from which the dust may beremoved while the stove is in operation by workmen above the groundlevel.

A still further object is to provide a stove having the novelconstruction, design and combination of parts hereinafter described andillustrated in the accompanying drawings.

' In the drawings:

Figure 1 is a sectional elevation through a stove constructed inaccordance with this invention.

Figure 2 is an enlarged sectional plan on the line 11-11 of Figure'l.

Figure-3 is an enlarged sectional elevation on the lineIH-lll otFigure2, showing the H checker wall construction.

Figure 4; is a similar view on the line IV-lV of Figure 2.

Referring more particularly to the drawings, the lette A designates theU-shaped enclosing wall or shell of the single pass stove of thisinvention as a whole, which is composed of a steel jacket 2, a-silocelor other insulating lining 3,- and a brick wall 4. The upper ends of theU-shaped shell are frusto-conical in shape and form combineddistributing and collecting chambers 5 and 6 for the gases passingthrough the stove. Y I

The chamber 5 has its reduced upper end connected directly with an airpreheater 7 in which an induced draft fan 8 is mounted. The preheater 7connects with a gas preheater 9 which in turn is connected to a stack10, so that the products of combustion are drawn through the stove bythe fan 8 and forced thrhugh the preheaters 7 and 9 and then into thestack 10.

A gas main 12 is connected to the preheater 9 and a gas conduit 13 leadsfrom the preheate119 to a gas burner 14 communicating at 15 with thecollecting and distributing chamber 6. An air supply conduit 15 leadsfrom the air preheater 7 to the burner 14 to supply heated air forsupporting combustion.

A hot blast main 16 is connected with the upper end of the chamber 6 bya conduit 17, and a cold blast main 18 is connected by a conduit 19 tothe upper end of the chamber 5.

A working platform 20 is supportedacross the upper ends of the stove, sothat the workmen may have ready access to the several parts of theapparatus.

Suitable valves of any Well known and accepted design may be providedfor controlling the flow of gas and air to and from the stove. A. valve21 is provided in the gas sup-ply conduit 13, and a valve 22 is providedin the air supply conduit 15, and valves 23 and 24 are provided in theconduits 17 and 19 leading from the hot and cold blast Ina-ins,respectively.

A novel form of checkerwork B is mounted form one fourth of a circularrecess or opening 29 formed by the abutting corners of four adjoiningbricks. 'lhe recesses or openings 29 are adapted to receive the reducedends of combined spacing and bafile bricks or tiles 30, which are builtinto and extend from one wall 25 to the next wall transversely of thegas channels 27.

The bricks or tiles 25 are each provided with a centrally arrangedcircular opening 31, which openings in each of the several walls arepreferably in alinement so as to form transverse gas passageways betweenthe several gas channels 4, thus permitting a trans,- verse flow ofgases to. equalize the flow and priissure of the gases in'each of thegas channe s.

The construction of the checkerwork B prevents the t'orming of dead orcool areas due to the transverse gas flow between the gas chan nels, andalso is 'more eflicient than checkerwork as heretofore generallyconstructed, since there is less surface upon which dust may collect.

The frusto-conical shaped distributing and collecting chambers 5 and(Shaw aventuri-like etlecton the gases or air entering the stove andthereby cause an equal distribution over the entire checkerwork.However, if for any reason the gas channels 27 did not all receive anequal supply of gas or air,'the openings 31 would cause the gases or airto flow transversely into the channels having the lesser volume. I

The novel stove and checker construction eliminates the necessity forthe use of supporting arches, pillars, flues etc., and, therefore, ismaterially cheaper to build.

By admitting the cold air to be heated at the stock end of the stove andcausing it to pass out of the burner end, a greater efliciency is hadsince the air passes over the hottest checkerwork after it has beenpreheated.

The shell or enclosing wall A of the stove is provided with a pluralityof cleaii-out or dust-removal openings 35, two of which communicate witheach of the gas channels 27 and are closed by doors 36. The majorportion of the dust will settle into the bottom of the gas channels 27,and the remainder which.

adheres to the checkerwork will be blown or otherwise caused to falldown into the lower end of the gas channels, where it may be readilycleaned out through'the openings 35.

While I have shown and described one specific embodiment of myinvention, it will be understood that I do not wish to be limitedthereto, since various modifications may be madewithout departing fromthe scope of my invention as defined in the appended claims.

Iclaim:

1. A single pass hot blast stove comprising asubstantially U-shapedshell having frusto-conical end portions, a checkerwork built in saidshell and terminating short of each end, the frusto-conical spaces ateach end forming distributing and collecting chambers for the gasespassing through said checkerwork.

2. A single pass hot blast stove comprising a substantially U-shapedshell having frustoconical end portions forming distributing andcollecting chambers for the gases, a checkerwork built in said shell andtenninating short of said frusto-conical ends, a gas burnercommunicating with one end, a hot blast main communicating with saidend,

a stack communicating with the other end,

a cold blast main. communicating with said other end, and valvescontrolling the operation of said gas burner and the flow of air fromsaid cold blast main and to said hot burner and the flow of air fromsaid cold blastma-in and to said hot blast main.

4. A single pass hot blast stove comprising a substantially U-shapedshell having frustoconical end portions forming Venturi-likedistributing and collecting chambers for the gases, a checkerwork builtin said shell and terminating'short of said frusto-conical ends, a gasburner communicating with one end, a hot blast main communicating withsaid end, a stack communicating with the other end, a cold blast maincommunicating with said other end, and valves controllingthe operationof said gas burner and the flow of'air from said cold blast main and tosaid hot blast main.

5. A single pass hot blast stove comprising a vertically disposedU-shaped shell having frusto-conical end portions formingVenturilikedistributing and collecting chambers, a checkerwork built in said shellbelow said chambers, a source of heat communicating with the upper endof one of said chambers, a hot-blast main communicating with saidchamber, an induced draft fan communicatingwith the other chamber, acold blast main communicating with said other chamber, saidVenturi-likechambers being adapted to cause an even distribution ofheated gases and draft in said checkerwork.

6. A single pass hot blast stove comprising a shell having end portionsforming distributing and collecting chambers for the gases, at least oneof said end portions being frustoconical in shape, a checkerwork builtin said shell and terminating short of said ends, a gas burnercommunicating with said frustoconical end portion, a hot blast maincommunicating with said end, a stack communieating with the other end, acold blast main communicating with said other end, and valvescontrolling the operation of said. gas burner-and the flow of air fromsaid cold blast main to said hot blast main. 1

In testimony whereof, I have hereunto set my hand.

FRANK ll. McGlClC.

